<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8" />
		<title></title>
		<script type="text/javascript">
			
			var num = 20;
			
			
			 //如果num为10，则输出哈哈哈哈哈哈
			 if(num == 10){
			 	alert("哈哈哈哈哈哈");
			 }
			
			
		</script>
	</head>
	<body>
		
	</body>
</html>
